Getting last updated from a sensor

[plush totem]

I have a temperature sensor - sensor.lounge.temperature - when I put it into an entity card it offers me the secondary value of "last updated" which is the value that I need. However, in the sensor, that value doesn't exist. AI led me to try {{ as_timestamp(states.sensor.lounge.temperature.last_updated) }} but that doesn't work. Grateful for any advice on how to get that "last updated" value please.

[main thistle]

1. i doubt you have a sensor called sensor.lounge.temperature, as that's not possible. maybe sensor.lounge_temperature?
2. last_updated is a property of the state object. so that would be {{ as_timestamp(states.sensor.lounge_temperature.last_updated) }}

[plush totem]

You're corect - that was a typo. Sorry.

I'll give that a go and see where I get! Thank you

[plush totem]

This is working... to a point. If there is no change in the temperature then the last_updated doesn't change. Is there any other way I can check when it last contacted HA even if it didn't change anything please?

[main thistle]

i don't think there is and if there was, it would depend on the integration by which you're getting your temp sensor data. why is that piece of information important to you?

[jagged temple]

It depends on the sensor and integration how that is handled - it should behave like that - last updated is the last time the value was checked, last changed is when it differed, but sadly not everyone does it like that

[main thistle]

last updated is the last time the value was checked, last changed is when it differed
i beg to differ, sir

however, apparently there is a last_reported which does just what @plush totem wants

[plush totem]

I'm using the temperature sensors to run a heating system. If any of them fail, I need to ensure that the heaters stop running while I fix the problem.

last_reported. Brilliant. How did you find that out please?

[main thistle]

good use case! check out what I've linked, it sounds like it does just the thing

[main thistle]

i was looking for documentation to contradict hilburn 😛 and stumbled across this

[plush totem]

Great stuff. I'll give that a nose. Many, many thanks.